292 COLUBRID^. 



cylindrical ; scales striated and keeled, with apical pits, in 19 rows ; 

 ventrals rounded. Tail moderate or rather long ; subcaudals in 

 two rows. Hypapophyses developed throughout the vertebral 

 column. 



Central America ; North-western South America. 



Syno2)sis of the Species. 



Subcaudals 75-101 ; five or six upper 



labials 1. diadematus, p. 292. 



Subcaudals 100 ; seven upper labials, pos- 

 terior keeled 2. labiosus, p. 293. 



Subcaudals 37-67 ; seven or eight upper 



labials 3. atratus, p. 293. 



1. Streptophorus diadematus. 



Ninia diademata, Baird ^- Gir. Cat. N. Am. Rept. p. 49 (1853) ; 



Cope, Proc. Ac. Philad. 1860, p. 340. 

 Streptophorus bilasciatus, Dum. Sf Bihr. vii. p. 520 (1854) ; Giinth. 



Cat. p. 16 (1858j ; Cope, Proc. Ac. Philad. 1860, p. 77 ; Jan, Arch. 



Zool. Anat. Phys. ii. 1863, p. 26, and Icon. Gen. 12, pi. iii. fig. 3 



(1865) ; Bocotirt, Miss. Sc. Me.v., Rept. p. 545, pi. xxxii. fig. ' 10 



(1883). 



Eostral about once and a half as broad as deep, visible from 

 above ; internasals and supraoculars small ; frontal as broad as 

 long, as long as its distance from the end of the snout, shorter than 

 the parietals ; loreal once and a half to twice as long as deep ; two 

 postoculars ; temporals l-|-2 or 2-|-3 ; six (exceptionally five) upper 

 labials, third and fourth entering the ej'e, sixth longest ; four lower 

 labials in contact with the anterior chin-shields ; posterior chin- 

 shields small. Scales in 19 rows, all strongly keeled. Ventrals 

 136-156; anal entire; subcaudals 75-101. Dark brown or 

 blackish grey above, usually with a light spot on each of the outer 

 scales ; upper lip and occiput yellowish ; the yellowish collar may 

 be interrupted in the median line ; belly and lower surface of tail 

 yellowish, with three longitudinal series of large black spots, or 

 black with a light border to each shield. 



Total length 415 millim. ; tail 125. 



Mexico. 



a. 2 (V. 142 ; C. 83). Mexico. M. Sall^ [C.]. 



b-e. (S (V. 140, 148 ; C. Huatuzco, Vera Cruz. F. D. Godman & O. 



96, 101) & $ (V. 156, Salvin,Esqr8.[P.]. 



150 ; C. 84, 75). 



/. Ilgr. $ (V. 137; C. Teapa, Tabasco. Mr.H. H.Smith[C.J. 



92). F. D. Godman &0. 



Salvin,Esqrs.[P.]. 



ff-h. Hgr. ^ (V. 140, 147 ; Oaxaca. Mi-. Hoege fC.]. 



C. 87, 97). 



